On the linearity of the MINOS light-injection calibration system

Adamson, P, Barrett, L, Belias, A, Blake, A, Cabrera, A, Falk, E, Harris, P G, Hartnell, J, Howcroft, C, Kordosky, M, Lang, K, Lee, R, Liu, J, Michael, D, Morse, R, Nelson, JK, Nichol, R, Pearce, G, Ruddick, K, Smith, P N, Symes, P A, Thomas, J, Vahle, PL, Webb, R, Weber, A and White, R F (2004) On the linearity of the MINOS light-injection calibration system. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 521 (2-3). pp. 361-366. ISSN 0168-9002

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The MINOS light-injection calibration system has been fully documented in a previous article (Nucl. Instr. and Meth. A 492 (2002) 353). Upon commissioning in the MINOS detectors, the system was found to give a non-linear response to variations in the intensity of injected light. The source of this non-linearity has been traced to a small change in the spectrum of the injected light as a function of the current applied to the original blue LEDs, in combination with a rapidly varying spectral response function of the wavelength-shifting fibre used in the detector. Both aspects of the problem have been addressed successfully by use of LEDs with different spectral characteristics, and the system now has a linear response.

Item Type: Article
Additional Information: Two small effects conspired together to produce an unexpected nonlinearity in the MINOS LI system. I was the first to realise the source of the problem, and I (together with the small group I led) was mainly responsible for finding the solution described in this paper. I wrote the paper. Non-Sussex authors mainly carried out tests on the installed system.
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Depositing User: Elisabeth Falk
Date Deposited: 06 Feb 2012 21:15
Last Modified: 17 Apr 2012 12:10
URI: http://sro.sussex.ac.uk/id/eprint/30461
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